100+ F5 Interview Questions | F5 Load Balancer Interview Questions

by | Aug 17, 2019 | F5 Load Balancers | 0 comments

F5 Networks is a global multinational company which specializes in application services and application delivery networking (ADN). They focus on availability, performance, security and delivery. F5 headquarters in Seattle, Washington. F5 Technologies is present in the data center and cloud. It is available in private, public and multi-cloud environments on platforms like AWS, Microsoft Azure, Google Cloud and Open Stack.

F5 is one of the top companies on the list of many network engineers to work for. If you are looking for a job at F5 or a job questions to Server Load Balancing then you should definitely go through the F5 Certification Questions provided below. These F5 Interview Questions will give you an overall gist of the probable questions asked in the interviews.

List of F5 Interview Questions. Let’s have a look at some of the top F5 interview questions. Downloadable PDF is available at the end of the post 🙂

  • What are iRules in F5 LTM?
  • What is iControl?
  • What is the default LTM MGMT port IP Address?
  • What is ConfigSync?
  • How is a member different than a node?
  • What is OneConnect and its benefit?
  • What is a load balancing pool?
  • What is meaning of session persistence and why is it required?
  • What is a profile?
  • What is RAM cache?
  • What type items are cached and not cached by RAM feature?
  • What type of lists are considered in URIL Lists?
  • Difference between Node and Pool member?
  • What are Virtual Servers?
  • What is meant by Pool?
  • What is meant by member?
  • What is TMM and its functionality?
  • What is key difference between LTM and GTM?
  • What is a tagged Interface?
  • Which Command line utility displays real-time statistical information forBIG-IP LTM?
  • What is cookie persistence?
  • What is Self IP address?
  • What is floating self IP address?
  • What is HTTP chunking?
  • Which are the latest LTM hardware models in market?
  • What is pipelining?
  • What is Predictive method?
  • What are the capabilities of LTM?
  • Which tasks are performed by LTM to offload server of responsibilities?
  • What are the authentication modules that can be implemented on F5Big-IP?
  • What is difference between APM and PAM?
  • What are the load balancing methods used in LTM?
  • Which all Health monitors are available on F5 LTM?
  • What are the deployment modes of F5 LTM?
  • What is SNAT in F5 LTM?
  • How does SNAT work?
  • What is rate shaping?
  • What are 3 key elements of iRule?
  • What is the minimum RAM required to run BIG-IP Virtual Edition on ESXi?
  • What are key elements to be considered while selecting an F5 Load balancer (LTM)?
  • What is a Static Load Balancing mode?
  • What is a Dynamic Load Balancing mode?
  • What is Server Load Balancing?
  • What information needs to be provided to set up an appliance to do cookie load balancing?
  • What is Health Check in refer to load balancer?
  • When load balancing to a real server, which server will be accessed first?
  • What is the difference between a Persistent Cookie Policy and a QoS Cookie Policy in array network loadbalancer?
  • What is Global Server Load Balancing (GSLB)?
  • Does the clustering needs to be turned on to use GSLB?
  • Which Load Balancing methods are supported with Array Network GSLB?
  • What is Reverse Proxy Cache?
  • Define LTM, GTM, APM, ASM.
  • What are the LTM setup steps?
  • How many characters does a base registration key have?
  • What does Set up Utility include?
  • What are pool members?
  • What are the devices represented by IP addresses of pool members?
  • A full proof proxy maintains how many session tables?
  • What is a proxy based design?
  • What is an intelligent SNAT?
  • How to monitor the number of concurrent connections going through the SNAT?
  • How is a member different than a node?
  • What is a load balancing transaction?
  • What is the primary reason for tracking and storing session data?
  • What is the Positive and Negative Security Model?
  • What are HTTP Header Method?
  • Which are the most important web server headers?
  • What do Phase 1 and Phase 2 do?
  • What 4 protocols is the SSL composed of?
  • What is the handshake protocol used for?
  • What is the Change Cipher Spec used for?
  • What is the Alert Protocol used for?
  • What is the Application data Protocol used for?
  • What Hash Algorithms are used in SSL “Client authentication?
  • Which two connection modes do IP Sec have?
  • What is a tunnel mode?
  • What is a transport mode?
  • Which metrics can GTM use when making load balancing decisions for a client?
  • Why do we need to use Layer 7 load balancing rather than Layer 3 and Layer 4?
  • What is the difference between hardware load balancer and virtual load balancer?
  • What is the difference between Local Traffic Manager and Global traffic Manager?
  • What information is required to set up my appliance to do Cookie Load Balancing?
  • When load balancing to a Real Server, which server will be accessed first?
  • What is Dynamic Content and Static Content? Can the ArrayAppliance Cache Dynamic Content?
  • What is Recursion Depth?
  • How does cache decide what to cache?
  • What algorithms are used for Cache Content Replacement?
  • What is real clustering?
  • What is virtual clustering and how does it work?
  • What parameters need to be defined in the cluster configuration?
  • What is the purpose of content rewrite?
  • What is the use of extern and static?
  • What is VLAN? How many bits are there is IPv4 protocol? What is RFC?
  • Difference between router, hub and switch?
  • Compare hash table and Binary balanced trees. List the scenarios when you will prefer hash table.
  • What is SNAT and why is it required?
  • Compare Global Traffic and SNAT.
  • Compare Virtual Servers and SNAT.
  • What is SNAT Automap?
  • What is the SNAT Automap order of difference?
  • Is Inline an alternative to SNAT and how?
  • How to capture the source address with SNAT?
  • Explain the benefits of using unique, custom profiles for virtual services.
  • Explain a service issue where load balancer inspection or configuration alteration led to or implemented a solution.
  • When would one recommend DSR vs full proxy?
  • How can one implement L3 DSR?
  • Do you encrypt traffic between the ADC and the service?
  • Do you prefer Apache with mod_proxy, Nginx, HAProxy or other proxy software? Why?
  • How do you automate service pools with proxies in use?
  • How much TCP manipulation have you performed on the service and why?
  • Explain the implementation, monitoring and adjusting QoS.
  • Why should one use the first-hop redundancy protocols and why? 
  • IGRP would you like to discuss configuration for What?
  • Can one use BGP as an IGRP?
  • What is the difference between checked and unchecked exceptions?

To crack the interview, thorough knowledge and skills related to Server Load Balancing is required. The above F5 interview questions are frequently asked in interviews to test candidates.

Recruiters will test your in-depth knowledge on the basis of all the questions. So we recommend you to be prepared with answers for the F5 Interview Questions. Lastly, precise answers to these F5 interview questions will help you get your dream job at your dream company.

Investing in F5 Training and Certification Courses could prove to be beneficial to crack your interview.

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